Pipe-wrench



T. NEWMAN.

PIPE WRENCH.

Patented Apr. 21, 1891.

(No Model.)

UNITED STATES PATENT OFFICE.

THOMAS NEWMAN, OF POPLAR BLUFF, MISSOURI.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 450,676, dated April21, 1891.

" Application filed January 30, 1891. Serial No. 279,731. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS NEWMAN, of the city of Poplar Bluff, Butlercounty, State of Missouri, have invented certain new and usefulImprovements in Piperenches, of which the following is a full, clear,and exact description, reference being had to the accompanyin gdrawings,forming a part hereof.

My invention relates to improvements in pipe-wrenches; and it consistsin the novel construction, arrangement, and combination of parts, aswill be more fully hereinafter described, and designated in the claims.

In the drawings, Figure 1 is a perspective View of my completeinvention, showing the peculiarconstruction and position of the teeth.Fig. 2 is a vertical longitudinal section of my device when applied to apipe, and Fig. 3 is a rear view of the bifurcated jaw detached.

Referring to the drawings, 1 indicates a bifurcated jaw, which ispreferably constructed out of one piece of material by the materialbeing bent at its median portion and compressed together where the lapis made, but the free and extended portions stand asunder for thepurposes hereinafter stated. Said jaw may also be made of one solidpiece of metal and split, thereby forming the bifurcations. Said jaw isprovided with an upright portion 7 and bifurcations 2 2, between whichbifurcations arm or lever 3 is interposed and therein pivotally secured.

The bifurcations 2, as well as the upright portion 7 of jaw l, areprovided on their inner surfaces with a series of ratchet-teeth. Theratchet-teeth formed on the upright portions of the jaw slantdownwardly, and those formed on the bifurcations 2 project toward arm 3when the same is secured in its normal position. Arm 3 is pivotallysecured between The bifurcations 2 by means of a bolt or rivet 4,thereby permitting the jaw to freely move in its pivotal connection. Thefront and lower terminal portion of arm 3 is provided with anapproximately parabolic marginal surface, the same being provided with aseries of ratchet-teeth 5. Said ratchetteeth are formed with their lowersurfaces approximately parallel to each other and also parallel to thestraight and plain upper portion of arm 3, so that when they arefunctionally applied to a pipe and when power is applied to saidarm theyimpinge and bite directly against the surface of the same. The angleformed by the upright portion 7 of jaw l and the bifurcations 2 isacute, so that when the same is placed over a pipe and the curvedportion of arm 1 is brought against said pipe three portions of saidpipe will be subjected to an impinging contact. One portion being indirect contact with the ratchet-teeth formed on the upright portion 7 ofjaw 1, another portion of the pipe in contact with the ratchetteethformed on the bifurcations 2, and the third in contact with theratchet-teeth formed words, by the formation of the acute angle betweenthe upright portion 7 and bifurcations 2 of jaw 1 and by the arm 3 beingprovided with a bulged or parabolic marginal surface, the pipe issubjected to more contactsurface than would otherwise be effected by anyother construction. The bifurcations 2 are situated asunder at such adistance that the front and terminal portion of'arm 3 is free to movedownwardly between the same at any desired distance or pass clearthrough.

The essential feature of my invention is in the construction of a wrenchwith few and simple parts and adapted to receive various sizes of pipesembodying an easy adjustment to receive diiferent sizes.

Having fully described my invention, what I claim is- 1. Apipe-wrenchconsisting of an arm the lower front terminal portion of which isprovided with an indented bulged surface and an angular jaw, the innersurface of the upright portion of said jaw being provided withdownwardly-formed teeth, substantially as set forth.

' 2. A pipe-wrench consisting of an arm the lower front terminal portionof which is provided with an indented bulged surface and an angularbifurcated jaw, the inner surface of the upright portion of saidbifurcation being provided with downwardly-formed teeth, substantiallyas set forth.

3. A pipe-wrench consisting of an arm the lower front terminal portionof which is provided with a bulged surface, the same being provided withratchet-teeth, the lower surfaces of which teeth are parallel and alsoparallel to the straight upper face of said arm,

on the rounded portion of arm 3, or, in other ro ter or pivot outwardand the angular bifurcated depending jaw pivoted thereto, said jawsbeing provided with ratehet-teeth to grip and hold the pipe,substantially as shown and described.

In testimony whereof I aflix my signature in 15 presence of twoWitnesses.

THOMAS NEWMAN. Witnesses:

CHARLIE HINRICHS, J r., E. O. LAOKS.

